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Related Experiment Video

Updated: May 23, 2026

Characterization of the Sense of Agency over the Actions of Neural-machine Interface-operated Prostheses

Characterization of the Sense of Agency over the Actions of Neural-machine Interface-operated Prostheses

Published on: January 7, 2019

Ideational apraxia and naturalistic action.

Cognitive Neuropsychology

|March 28, 2012

Summary

Ideational apraxia, difficulty performing complex actions, is often linked to left-hemisphere damage. This study found no unique vulnerability in left-hemisphere stroke patients, suggesting broader cognitive factors may be involved.

Area of Science:

Neuroscience
Cognitive Psychology
Neurology

Background:

Ideational apraxia, the impairment of complex object-related actions, is commonly attributed to left-hemisphere dysfunction.
Previous research suggests a strong lateralization of ideational apraxia to the left cerebral hemisphere.

Purpose of the Study:

To investigate the role of left-hemisphere damage in naturalistic action performance.
To challenge the notion that ideational apraxia is exclusively a left-hemisphere syndrome.

Main Methods:

Study 1 compared action errors in left-hemisphere stroke patients (LCVA) with right-hemisphere stroke (RCVA) and closed head injury (CHI) patients.
Study 2 involved a detailed comparison of a severe ideational apraxia patient with left-hemisphere damage against two RCVA patients of similar clinical severity.

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Characterization of the Sense of Agency over the Actions of Neural-machine Interface-operated Prostheses

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Main Results:

Left-hemisphere stroke patients did not exhibit greater action errors than other patient groups when controlling for disease severity.
Patients with left-hemisphere damage and ideational apraxia showed similar error patterns to right-hemisphere stroke patients.

Conclusions:

Left-hemisphere damage does not uniquely or transparently impair complex action performance.
Nonspecific resource limitation is proposed as an alternative explanation for ideational apraxia across different patient groups.